Being a resident of the Channel Islands, I'd like to point out that Sark is not actually autonomus as such, Sark is a part of the Balliwick of Guernsey (the second largest Channel Island). Harry is a resident of Sark, but his passport would be a Guernsey passport. It's not a particularly vital thing, and it is Brit-picking (or should I say Island-picking to the extreme.
Other than that, I feel this story is far to abrupt, but a good idea nonetheless